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Significant Accounting Policies - Summary of Reclassification of Prior Year Balances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Cost of revenue and operations   $ 92,367  
Product and technology   73,970  
Marketing and sales   232,884  
General and administrative   59,684  
Affiliate revenue share $ 20,790 15,488 $ 8,948
Depreciation and amortization 116,877 103,810 88,639
Total operating expenses 1,052,742 578,203 492,006
Cost of revenue and operations   (1,934)  
Product and technology   (5,181)  
Marketing and sales   (6,144)  
General and administrative   13,259  
Affiliate revenue share   0  
Depreciation and amortization   0  
Total operating expenses   0  
Cost of revenue and operations   90,433  
Product and technology 62,859 68,789 74,162
Marketing and sales 217,432 226,740 209,813
General and administrative $ 73,772 $ 72,943 $ 44,903